Cutting across all lanes of traffic to make a turn at the last second. Usually on a multi-lane freeway, driving in the complete left lane, sitting all the way back in your seat with one hand on top of the wheel and just cutting the wheel to the right without even checking your mirrors.
(driving down the highway on a motorcycle)
you: there's an exit coming up in 100 feet, check out that rusted out old impala
(cuts across 4 lanes of traffic to make the exit)
you: check out that nigga slide